Study of CP-violating asymmetries in B0→π+π- decays -: art. no. 071801

被引：26

作者：

Abe, K ^{[1
]}

Abe, T

Adachi, I

Ahn, BS

Aihara, H

Akatsu, M

Asano, Y

Aso, T

Aulchenko, V

Aushev, T

Bakich, AM

Ban, Y

Banas, E

Bedny, I

Behari, S

Behera, PK

Bondar, A

Bozek, A

Bracko, M

Brodzicka, J

Browder, TE

Casey, BCK

Chang, P

Chao, Y

Cheon, BG

Chistov, R

Choi, SK

Choi, Y

Danilov, M

Dong, LY

Dragic, J

Drutskoy, A

Eidelman, S

Eiges, V

Enari, Y

Everton, CW

Fang, F

Fujii, H

Fukunaga, C

Fukushima, M

Gabyshev, N

Garmash, A

Gershon, T

Golob, B

Gordon, A

Guo, R

Haba, J

Hamasaki, H

Hanagaki, K

机构：

[1] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan

[2] Aomori Univ, Aomori, Japan

[3] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[4] Chiba Univ, Chiba, Japan

[5] Chuo Univ, Tokyo 112, Japan

[6] Univ Cincinnati, Cincinnati, OH USA

[7] Univ Frankfurt, D-6000 Frankfurt, Germany

[8] Gyeongsang Natl Univ, Chinju, South Korea

[9] Univ Hawaii, Honolulu, HI 96822 USA

[10] Hiroshima Inst Technol, Hiroshima, Japan

[11] Univ Tokyo, Inst Cosm Ray Res, Tokyo, Japan

[12] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China

[13] Inst High Energy Phys, Vienna, Austria

[14] Inst Theoret & Expt Phys, Moscow 117259, Russia

[15] Jozef Stefan Inst, Ljubljana, Slovenia

[16] Kanagawa Univ, Yokohama, Kanagawa, Japan

[17] Korea Univ, Seoul 136701, South Korea

[18] Kyoto Univ, Kyoto, Japan

[19] Kyungpook Natl Univ, Taegu 702701, South Korea

[20] Univ Lausanne, IPHE, Lausanne, Switzerland

[21] Univ Ljubljana, Ljubljana, Slovenia

[22] Univ Maribor, SLO-2000 Maribor, Slovenia

[23] Univ Melbourne, Parkville, Vic 3052, Australia

[24] Nagoya Univ, Nagoya, Aichi, Japan

[25] Nara Womens Univ, Nara 630, Japan

[26] Natl Kaohsiung Normal Univ, Kaohsiung, Taiwan

[27] Natl Lien Ho Inst Technol, Miaoli, Taiwan

[28] Natl Taiwan Univ, Taipei 10764, Taiwan

[29] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland

[30] Nihon Dent Coll, Niigata, Japan

[31] Niigata Univ, Niigata, Japan

[32] Osaka City Univ, Osaka 558, Japan

[33] Osaka Univ, Osaka, Japan

[34] Panjab Univ, Chandigarh 160014, India

[35] Peking Univ, Beijing 100871, Peoples R China

[36] Princeton Univ, Princeton, NJ 08544 USA

[37] RIKEN, BNL, Res Ctr, Brookhaven, NY USA

[38] Saga Univ, Saga 840, Japan

[39] Seoul Natl Univ, Seoul, South Korea

[40] Sungkyunkwan Univ, Suwon, South Korea

[41] Univ Sydney, Sydney, NSW 2006, Australia

[42] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[43] Toho Univ, Funabashi, Chiba 274, Japan

[44] Tohoku Gakuin Univ, Tagajo, Miyagi, Japan

[45] Tohoku Univ, Sendai, Miyagi 980, Japan

[46] Tokyo Inst Technol, Tokyo 152, Japan

[47] Tokyo Metropolitan Univ, Tokyo 158, Japan

[48] Tokyo Univ Agr & Technol, Tokyo, Japan

[49] Toyama Natl Coll Maritime Technol, Toyama, Japan

[50] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.89.071801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a measurement of CP-violating asymmetries in B(0)-->pi(+)pi(-) decays based on a 41.8 fb(-1) data sample collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We fully reconstruct one neutral B meson as a B(0)-->pi(+)pi(-) CP eigenstate and identify the flavor of the accompanying B meson from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain the CP-violating asymmetry parameters S(pipi)=-1.21(-0.27)(+0.38)(stat)(-0.13)(+0.16)(syst) and A(pipi)=+0.94(-0.31)(+0.25)(stat)+/-0.09(syst).

引用

页数：6

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